pyrad.lbl.hitran.spectral_lines module

class pyrad.lbl.hitran.spectral_lines.SpectralLines(database, total_partition_function)

Bases: object

Hitran spectral line parameters for a molecule.

delta

Numpy array of air-broadended pressure shifts [cm-1 atm-1] (lines).

en

Numpy array of transition lower state energies [cm-1] (lines).

gamma_air

Numpy array of air-broadened halfwidths [cm-1 atm-1] (lines).

gamma_self

Numpy array of self-broadened halfwidths [cm-1 atm-1] (lines).

id

HITRAN molecule id.

iso

Numpy array of HITRAN isotopologue ids (lines).

mass

Numpy array of isotopologue masses [g] (lines).

n

Numpy array of air-broadened temperature dependence powers (lines).

s

Numpy array of line strengths [cm] (lines).

q

TotalPartitionFunction object.

v

Numpy array of transition wavenumbers [cm-1] (lines).

absorption_coefficient(temperature, pressure, partial_pressure, wavenumber, cut_off=25.0)

Calculates the absorption coefficient.

Parameters

• temperature – Temperature [K].

• pressure – Pressure [atm].

• partial_pressure – Partial pressure [atm].

• wavenumber – Numpy array of wavenumbers [cm-1] (wavenumber).

• cut_off – Distance [cm-1] from the transition frequency where the line is cut off.

Returns

Numpy array of absorption coefficients [cm2] (wavenumber).

correct_line_strengths(temperature)

Temperature-corrects the line strengths.

Parameters

temperature – Temperature [K].

Returns

Numpy array of corrected line strengths [cm] (lines).

pressure_shift_transition_wavenumbers(pressure)

Pressure-shifts transition wavenumbers.

Parameters

pressure – Pressure [atm].

Returns

Numpy array of pressure-shifted transition wavenumbers [cm-1] (lines).

static temperature_correct_line_strength(q, t, iso, en, v)

Temperature-corrects a line strength. :param q: TotalPartitionFunction object. :param t: Temperature [K]. :param iso: HITRAN isotopologue id. :param en: Transition lower state energy [cm-1]. :param v: Transition wavenumber [cm-1].

Returns

Temperature correction factor.